Tension knob for an exerciser



FIG. 1 is a perspective view of a tension knob for an exerciser showingmy new design, wherein the broken line showing of the exerciser is forillustrative purposes only and forms no part of the claimed design;

FIG. 2 is a front perspective view of the tension knob for an exerciser;

FIG. 3 is a rear perspective view thereof;

FIG. 4 is a left side elevational view thereof, the right sideelevational view being a mirror image;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

The ornamental design for a tension knob for an exerciser, as shown and described. 